TRIFID MANDIBULAR CONDYLE: REPORT OF A RARE CASE
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1 TRIFID MANDIBULAR CONDYLE: REPORT OF A RARE CASE Khushboo Singh, MDS 1, Dr. Sujata Mohanty, MDS 2, Mahesh Verma, MDS, MBA, PhD 3, Sunita Gupta, MDS, MBA (HCA) 4, Sujoy Ghosh, MDS 5, and Meera Choudhary, BDS 6 1 Senior Research Associate, Department of Oral Medicine and Radiology Maulana Azad Institute of Dental Sciences, New Delhi 2 Professor and Head, Department of Oral and Maxillofacial Surgery, Maulana Azad Institute of Dental Sciences, New Delhi 3 Director-Principal, Maulana Azad Institute of Dental Sciences, New Delhi 4 Professor and Head, Department of Oral Medicine and Radiology, Maulana Azad Institute of Dental Sciences, New Delhi 5 Associate Professor, Department of Oral Medicine and Radiology, Maulana Azad Institute of Dental Sciences, New Delhi 6 Lecturer, Department of Oral Medicine and Radiology, Maulana Azad Institute of Dental Sciences, New Delhi ABSTRACT The incidence of bifid/trifid condyle is very rare. In most cases, it is an incidental finding on radiograph as only few cases have been reported with the symptoms of temporomandibular joint disorder. In the current era of advanced imaging modalities, the evaluation of such cases has become easier to accomplish. The present case of a 24 year old female describes the findings of trifid condyle on one side and bifid condyle on the other side associated with the history of trauma at 3 years of age. The patient had presented with no major complaints except for a slight reduction in mouth opening. INTRODUCTION The presence of extra heads on the mandibular condyle which can be in the form of bifid (two heads) or trifid (three heads) or tetrafid (four heads) is a very unusual and rare finding. 1 The morphology may range from just a simple groove to separate condylar heads. As most of the cases are asymptomatic, this finding is usually diagnosed as an incidental finding on a radiograph. 2 Symptomatic patients present with the signs and symptoms of temporomandibular joint disorders like restricted mandibular movements and pain in the preauricular region. However with advancements in the field of imaging there has been an upsurge in the number of reported cases. Although, the exact aetiology is unknown, some circumstances such as trauma, teratogenic drug use, genetics, infection and exposure to radiation may be responsible for these variations. 3 This report presents a case of trifid mandibular condyle on one side and bifid condyle on the other side with a history of childhood trauma. CASE REPORT A 24-year-old female reported with the chief complaint being a slight reduction in opening of her mouth. The past medical history and family history was noncontributory. The patient was born by a normal vaginal delivery. Examination revealed reduced mouth opening of approximately 15 mm, right and left lateral movement of 5 mm, and protrusive movement of 3mm (Figure 1). Temporomandibular joint (TMJ) examination revealed no joint sounds, no tenderness of masticatory musculature and no bony pathology. Lateral profile revealed slight retrusion of the chin (Figure 1). There was no facial asymmetry with no deviation. Panoramic radiograph revealed bilateral bifid mandibular condyles with the articulation of articular eminence within the cleft between bifid condyles, reduced length of the ramus bilaterally, and a deep bilateral antegonial notch (Figure 2). There was no lytic or sclerotic lesion involving mandibular condyles, glenoid fossa, and articular eminence. For a more detailed evaluation as well as to rule out any TMJ pathology, three-dimensional (3D) CT reconstruction was performed. Reformatted axial, sagittal and coronal CT images showed bifurcated mandibular condyles on both sides (Figure 3). There was no evidence of any other bony pathology with normal contours of the articular surfaces. 3D reconstructed images on the right side showed bifurcated right mandibular condyle and a tubercle over bifurcation area may be suggestive of one or more rudimentary condylar heads (Figure 4) on the left side images showed trifurcated condylar heads (Figure 4). There was reduced ramus length bilaterally with deep antegonial notch. As there was no gross deformity, no functional impairment and the patient was not willing to undergo treatment, it was decided to follow up on a regular basis. DISCUSSION The term bifid and trifid means two and three condylar heads. The occurrence of these anomalies is the 13
2 Figure 1: Photograph showing reduced mouth opening & retruded chin Figure 2: Panoramic radiograph showing bilateral bifid condyle (shown by arrows), reduced ramus height, deep antegonial notch 14
3 Figure 3: Axial, sagittal & coronal sections of CT scan showing bifid mandibular condyle (shown by arrows) Figure 4: 3D reconstructed view showing bifid right mandibular condyle & trifid left mandibular condyle 15
4 a variation of the same clinical entity. The exact etiology and pathogenesis of this anomaly is not clear but most accepted theories postulate trauma as the origin. 4,5 Trauma to the growth centres of the mandibular condyle may lead to deficient remodelling and subsequently result in these types of morphological variations. 5,6,7 In addition, teratogenic drug use, genetics, infection and exposure to radiation may be responsible for these types of variations. 8 Only 8 cases of trifid mandibular condyle were found in the literature (Table 1) 9,10,11,12,13 Most of the cases include a previous history of trauma which led to the anomaly of bifid and trifid mandibular condyle hence it can be postulated that trauma is the most common aetiology behind this altered morphogenesis. Antoniades et al mentioned that the literature revealed previous history of trauma in 25% of the bifid mandibular cases. 5 Sahman et al reported one case of tetrafid condyle which was totally asymptomatic. 1 Dennison et al suggested that the terminology of bifid mandibular condyle is used when segments of condyle are situated anteriorly and posteriorly in the sagittal plane and that it is not a pathological lesion nor the result of trauma rather it is a structural adaptation of mandibular condyle. 17 So its exact pathogenesis is still not elucidated. Condylar splitting may range from shallow groove to distinct heads of mandibular condyle. In our case, right mandibular Table 1: Literature Review of Trifid Mandibular Condyle Author Age/ Sex Side Previous history of trauma condyle was bifid but there was a well-defined tubercle in the condylar notch region which might be the origin of one more condylar head but it had not developed completely. Whereas on the left side there were 3 distinct condylar heads. Symptoms shown by these types of cases vary from case to case with predominant patients being asymptomatic and are diagnosed as an incidental finding on the radiograph. However, symptomatic cases present with the symptoms of temporomandibular joint disorder such as restricted mandibular movements, joint sounds, pain, deviation of mandible, facial asymmetry, and ankyloses.4,18,19 Our patient presented with no other functional abnormalities except reduced mouth opening and restricted lateral excursion of the mandible. There was no facial asymmetry. When these types of incidental findings are seen on a panoramic radiograph and there are symptoms of joint sounds, restricted movements with asymmetry then all possible radiographic diagnosis for morphological anomalies of mandibular condyle should be evaluated and various conditions such as degenerative diseases involving TMJ, ankylosis, benign tumours and primary or metastatic malignant neoplasms should be ruled out by higher imaging modalities such as CT and MRI. No treatment is required in asymptomatic cases. Whereas symptomatic cases are managed conservatively when it Symptoms Artvinli & Kansu 9 25/F L Yes, at 3 years of age Incidental finding, deviation of mandible to left side Antoniades et al 10 15/M L Yes, at 5 years of age Restricted mandibular movements, mandibular hypoplasia, snoring Cagirankaya & 52/F R No Incidental finding, deviation of mandible to Hatipoglu 11 right side Sezgin & Kayipmaz 12 31/F R Yes, at 11 years of age Incidental finding, deviation of mandible to right side Jha et al 13 6/F R Yes, at 4 years of age Restriction of mandibular movements Warhekar et al 14 37/F R Yes, at 3 months of age Facial asymmetry, clicking on right side, deviation of mandible to right side Prasanna et al 15 26/F R No Facial asymmetry, deviation of mandible to left side, mandibular hypoplasia Rana & Dhaliwal 16 17/M R Yes, at 7 years of age Restricted mandibular movements, deviation of mandible to right side, 16
5 comes to TMJ disorders. Therapy may consist of analgesics, anti-inflammatory agents, muscle relaxants, physiotherapy and splints. Patients with a severely restricted mouth opening and ankyloses are treated with surgical modalities. Since our case had no gross functional abnormalities, facial asymmetry except reduced mouth opening and was not willing to undergo treatment, she was kept under a follow up plan. CONCLUSION Clinicians should be aware of the morphological variations of mandibular condyle which may be observed during routine radiographic examination. Appropriate imaging modalities should be used to rule out other disorders involving TMJ. In general, asymptomatic cases do not require any treatment and should be kept under routine follow up and the patient should be informed about these variations. Symptomatic cases can be treated conservatively. REFERENCES 1. Sahman H, Etoz OA, Sekerci AE, Etoz M, Sisman Y. Tetrafid mandibular condyle: a unique case report and review of the literature. Dentomaxillofac Radiol 2011; 40, Hersek N, Ozbek M, Tasar F, Akpinar E, Firat M. Bifid mandibular condyle: a case report. Dent Traumatol 2004; 20: Mangenello-Souza LC, Mariani PB. Temporomandibular joint ankyloses: report of 14 cases. Int J Oral Maxillofac Surg. 2003; 32: Quayle AA, Adams JE. Supplemental mandibular condyle. Br J Oral Maxillofac Surg 1986; 24: Antoniades K, Karakasis D, Elephteriades J. Bifid mandibular condyle resulting from a sagittal fracture of the condylar head. MaxilBr J Oral lofac Surg 1993; 31: To EW. Mandibular ankyloses associated with a bifid condyle. J Craniomaxillofac Surg 1989; 17: To EW. Supero-lateral dislocation of sagittally split bifid mandibular condyle. Br J Oral Maxillofac Surg 1989; 27: Daniels JS, Ali I. Post-traumatic bifid condyle associated with temporomandibular joint ankyloses: Report of a case and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2005; 99: Artvinli LB, Kansu O. Trifid mandibular condyle: a case report. Oral Surg Oral Med Oral Pathol 2003; 95: Antoniades K, Hadjipetrou L, Antoniades V, Paraskevopoulos K. Bilateral bifid mandibular condyle. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2004; 97: Cagirankaya LB, Hatipoglu MG. Trifid mandibular condyle: a case report. J Craniomandibular Pract 2005; 23: Sezgin OS, Kayipmaz S. Trifid mandibular condyle: a case report. Oral Radiol 2009; 25: Jha A, Khalid M, Sahoo B. Posttraumatic bifid and trifid mandibular condyle with bilateral temporomandibular joint ankyloses. J Craniofac Surg 2013; 24(2):e Warhekar AM, Wanjari PV, Phulambrikar T. Unilateral trifid mandibular condyle: a case report. Cranio 2011; 29(1): Prasanna TR, Setty S, Udupa VV, Sahana DS. Bilateral condylar anomaly: A case report and review. J Oral Maxillofac Pathol 2015; 19: Rana D, Dhaliwal H. Post traumatic trifid condyle with temporomandibular joint ankyloses: a case report. International Journal of Medical Science and Education 2016; 3(4): Dennison J, Mahoney P, Herbison P, Dias G. The false and the true bifid condyles. Homo 2008; 59: Formand M. Mandibular condylar head duplication. A case report. J Maxillofac Surg 1981; 9: Forman GH, Smith NJ. Bifid mandibular condyle. Oral Surg Oral Med Oral Pathol 1984; 57: Address Correspondence To: Dr. Khushboo Singh, MDS, Senior Research Associate, Department of Oral Medicine and Radiology, Maulana Azad Institute of Dental Sciences, New Delhi Contact no
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